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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Millions
 12 Months Ended
May. 31, 2015
May. 31, 2014
Property, Plant and Equipment, Net [Abstract]    
Computer, network, machinery and equipment $ 3,345 $ 2,468
Buildings and improvements 2,721 2,582
Furniture, fixtures and other 547 531
Land 589 632
Construction in progress 93 26
Total property, plant and equipment 7,295 6,239
Accumulated depreciation (3,609) (3,178)
Total property, plant and equipment, net $ 3,686 $ 3,061
Minimum    
Property, Plant And Equipment [Line Items]    
Estimated Useful Lives 1 year  
Maximum    
Property, Plant And Equipment [Line Items]    
Estimated Useful Lives 50 years  
Computer, network, machinery and equipment | Minimum    
Property, Plant And Equipment [Line Items]    
Estimated Useful Lives 1 year  
Computer, network, machinery and equipment | Maximum    
Property, Plant And Equipment [Line Items]    
Estimated Useful Lives 5 years  
Buildings and improvements | Minimum    
Property, Plant And Equipment [Line Items]    
Estimated Useful Lives 1 year  
Buildings and improvements | Maximum    
Property, Plant And Equipment [Line Items]    
Estimated Useful Lives 50 years  
Furniture, fixtures and other | Minimum    
Property, Plant And Equipment [Line Items]    
Estimated Useful Lives 3 years  
Furniture, fixtures and other | Maximum    
Property, Plant And Equipment [Line Items]    
Estimated Useful Lives 10 years